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WikiPedia: Saskatoon (cây) http://www.cbc.ca/news/canada/britain-plucks-saska... http://www.omafra.gov.on.ca/english/crops/facts/in... http://www.prairie-elements.ca/saskatoons.html http://linnet.geog.ubc.ca/Atlas/Atlas.aspx?sciname... http://www.oup.com/oxforddnb/info/freeodnb/librari... http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatmen... http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatmen... http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatmen... http://andrewsforest.oregonstate.edu/lter/pubs/web... http://sbe.umaine.edu/amelanchier/?page_id=134